Test of Independence A reacarcher suspects that color blindness is inherited by a sex-linked gone. This possibility is examined by looking for a relationship between gender and color vision. The researcher tests a sample of 1000 people for color blindness, and then classifics them according to their sex and color vision status (normal, red-green blind, other color blindness). Is color blindness related to gender? Observed frequencies and total frequencies for each row and column are provided below. Normal Red-Green Other Totals Color Color Color Vision Blindness Blindness Male 320 70 400 Female 580 10 10 600 Totals 900 80 N = 1000 4) What are the expected frequencies? Normal Red-Green Other Totals Color Color Color Vision Blindness Blindness Male 400 Female 600 Totals 900 80 N = 1000 5) If a = .05, what are the degrees of freedom and the critical value? df = critical value = (fo-fe)= fe 6) Calculate for all of the cells in the first row of the table. Normal Red-Green Other Color Color Color Vision Blindness Blindness Male 7) If x2 = 83.44, should we reject or retain the null hypothesis